This film examines many features of today's landscapes which cannot be explained by processes at work around them, and explains that observation of the work of modern glaciers establishes that these anomalies could only have been caused by a massive sheet of moving ice. It proposes the hypothesis that glacial ice moved south at least four times in geologic history, and that its shape and size correspond approximately with the distribution of glacial features. This is one in the series of exceptional American Geographical Institute (AGI) films made by Encyclopaedia Britannica Films. The educational consultant was John Shelton, and a standard feature of Shelton AGI films was the sound of the airplane's drone during aerial shots. Director Charles L. "Chuck" Finance has an illustrious acreer in film, including supervising the visual effects in 'Dune' and 'Bill and Ted’s Excellent Adventure.' More on Finance at http://www.afana.org/finance.htm

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